I have finally managed to create a suitable report template using JasperSoft Studio which works fine when generated in the software. But after creating a .jar package using Maven and deploying it in the "Definitions" folder, I get an error message that the subreport cannot be found.

The main.jrxml and subreport.jrxml are in the same folder.

The Subreport is referenced by:

<subreportExpression><![CDATA["Subreport.jasper"]]></subreportExpression>

What am I missing?